C# winform 编程 向ACCESS数据库导入EXCEL表使用心得

 public string MyConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=ErLake.mdb";
        /// <summary>
        /// 获取Excel文件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>

        private void button1_Click(object sender, EventArgs e)
        {


            OpenFileDialog dlg = new OpenFileDialog();
            dlg.Filter = "Excel文件(*.xls)|*.xls";
            if (dlg.ShowDialog() == DialogResult.OK)
            {
                string filePath = dlg.FileName;
                this.textBox1.Text = filePath;
            }


        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (textBox1.Text.Length == 0)
            {
                MessageBox.Show("请选择导入数据的Execl文件");
            }
            else
            {
                try
                {
                    OleDbConnectionStringBuilder connectStringBuilder = new OleDbConnectionStringBuilder();
                    connectStringBuilder.DataSource = this.textBox1.Text.Trim();
                    connectStringBuilder.Provider = "Microsoft.Jet.OLEDB.4.0";
                    connectStringBuilder.Add("Extended Properties", "Excel 8.0");
                    using (OleDbConnection cn = new OleDbConnection(connectStringBuilder.ConnectionString))
                    {
                        DataSet ds = new DataSet();
                        string sql = "Select * from [Sheet1$]";
                        OleDbCommand cmdLiming = new OleDbCommand(sql, cn);
                        cn.Open();
                        using (OleDbDataReader drLiming = cmdLiming.ExecuteReader())
                        {
                            ds.Load(drLiming, LoadOption.OverwriteChanges, new string[] { "Sheet1" });
                            DataTable dt = ds.Tables["Sheet1"];
                            if (dt.Rows.Count > 0)
                            {
                                for (int i = 0; i < dt.Rows.Count; i++)
                                {
                                    //写入数据库数据
                                   // string MySql = "insert into 洱海各月出流流量 values('" + dt.Rows[i]["年"].ToString() + "','" + dt.Rows[i]["一月"].ToString()+ "','0','" + dt.Rows[i]["备注"].ToString() + "','0','" + i.ToString() + "')";
                                    string MySql = "insert into 洱海各月出流流量 values('" + dt.Rows[i]["年"].ToString() + "','" + 
                                        dt.Rows[i]["一月"].ToString() + "','" +
                                        dt.Rows[i]["二月"].ToString() + "','" +
                                        dt.Rows[i]["三月"].ToString() + "','" +
                                        dt.Rows[i]["四月"].ToString() + "','" + 
                                        dt.Rows[i]["五月"].ToString() + "','" + 
                                        dt.Rows[i]["六月"].ToString() + "','" + 
                                        dt.Rows[i]["七月"].ToString() + "','" + 
                                        dt.Rows[i]["八月"].ToString() + "','" +
                                        dt.Rows[i]["九月"].ToString() + "','" + 
                                        dt.Rows[i]["十月"].ToString() + "','" + 
                                        dt.Rows[i]["十一月"].ToString() + "','" + 
                                        dt.Rows[i]["十二月"].ToString() + "','" + 
                                        dt.Rows[i]["全年平均"].ToString() + "')";
                                    SQLExecute(MySql);
                                }
                                MessageBox.Show("数据导入成功！");
                            }
                            else
                            {
                                MessageBox.Show("请检查你的Excel中是否存在数据");
                            }
                        }
                    }
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.ToString());
                }

            }
        }

        /// <summary>
        /// 数据操作通用类
        /// </summary>
        /// <param name="sql"></param>
        /// <returns></returns>
        public bool SQLExecute(string sql)
        {
            try
            {
                OleDbConnection conn = new OleDbConnection(MyConnectionString);
                conn.Open();
                OleDbCommand comm = new OleDbCommand();
                comm.Connection = conn;
                comm.CommandText = sql;
                comm.ExecuteNonQuery();
                comm.Connection.Close();
                conn.Close();
                return true;
            }
            catch
            {
                return false;

            }
        }
    }

上面这段代码可以向ACCESS数据库表中导入EXCEL表，但是有个问题：导入数据后，查询数据表的数据发现新导入的数据出现在查询结果的前面，这不是我想要的，怎么办呢，我就采用字段升序排序的方式解决该问题！结果证明是有效的！

       string MySQL = "Select * from 洱海各月出流流量 order by 年 asc";